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New Member

BGP flap

We have p2p link between SanDeago and Mexico, configured with BGP.

 

in recent times the link is plapping continuously, plz check below bgp config on both routers.

 

NatPen_MX_3825#sh run | be bgp
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 10.60.0.0 mask 255.255.0.0
redistribute static metric 20 route-map MXCAMMAP
neighbor 10.63.0.1 remote-as 1
neighbor 10.63.0.1 fall-over
no auto-summary
!


NatPen_MX_3825#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.63.0.1 to network 0.0.0.0

199.220.41.0/30 is subnetted, 1 subnets
B 199.220.41.176 [20/0] via 10.63.0.1, 00:00:13
1.0.0.0/24 is subnetted, 1 subnets
B 1.4.204.0 [20/0] via 10.63.0.1, 00:00:13
152.177.0.0/30 is subnetted, 1 subnets
B 152.177.74.24 [20/0] via 10.63.0.1, 00:00:13
152.181.0.0/30 is subnetted, 1 subnets
B 152.181.185.68 [20/0] via 10.63.0.1, 00:00:13
206.113.119.0/26 is subnetted, 2 subnets
B 206.113.119.128 [20/0] via 10.63.0.1, 00:00:13
B 206.113.119.0 [20/0] via 10.63.0.1, 00:00:13
199.220.194.0/30 is subnetted, 1 subnets
B 199.220.194.232 [20/0] via 10.63.0.1, 00:00:13
172.17.0.0/30 is subnetted, 1 subnets
B 172.17.29.0 [20/0] via 10.63.0.1, 00:00:13
172.16.0.0/24 is subnetted, 1 subnets
B 172.16.1.0 [20/0] via 10.63.0.1, 00:00:13
172.18.0.0/30 is subnetted, 2 subnets
B 172.18.30.0 [20/0] via 10.63.0.1, 00:00:13
B 172.18.29.0 [20/0] via 10.63.0.1, 00:00:13
172.21.0.0/30 is subnetted, 1 subnets
D 172.21.106.120 [220/63232] via 172.20.107.229, 5d03h, Serial2/0
172.20.0.0/30 is subnetted, 1 subnets
C 172.20.107.228 is directly connected, Serial2/0
172.23.0.0/30 is subnetted, 1 subnets
B 172.23.9.0 [20/0] via 10.63.0.1, 00:00:13
172.22.0.0/30 is subnetted, 2 subnets
B 172.22.0.144 [20/0] via 10.63.0.1, 00:00:13
D 172.22.157.84 [220/63232] via 172.20.107.229, 5d03h, Serial2/0
172.32.0.0/24 is subnetted, 1 subnets
B 172.32.7.0 [20/0] via 10.63.0.1, 00:00:13
10.0.0.0/8 is variably subnetted, 21 subnets, 5 masks
B 10.30.0.0/21 [20/0] via 10.63.0.1, 00:00:13
B 10.31.0.0/16 [20/0] via 10.63.0.1, 00:00:13
B 10.30.13.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.20.0.0/16 [20/0] via 10.63.0.1, 00:00:14
B 10.21.0.0/16 [20/0] via 10.63.0.1, 00:00:14
B 10.40.0.0/16 [20/0] via 10.63.0.1, 00:00:14
B 10.41.0.0/16 [20/0] via 10.63.0.1, 00:00:14
C 10.63.0.0/16 is directly connected, GigabitEthernet0/1
S 10.61.1.0/24 [1/0] via 10.60.0.2
C 10.60.0.0/16 is directly connected, GigabitEthernet0/0
B 10.100.0.44/30 [20/0] via 10.63.0.1, 00:00:14
B 10.133.201.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.100.0.32/30 [20/0] via 10.63.0.1, 00:00:14
B 10.90.0.0/16 [20/0] via 10.63.0.1, 00:00:14
B 10.172.16.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.4.204.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.4.205.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.3.202.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.4.202.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.4.201.0/24 [20/0] via 10.63.0.1, 00:00:14
B 10.254.254.240/32 [20/0] via 10.63.0.1, 00:00:14
147.225.0.0/30 is subnetted, 1 subnets
B 147.225.40.160 [20/0] via 10.63.0.1, 00:00:14
B 206.169.74.0/24 [20/0] via 10.63.0.1, 00:00:14
B 192.168.100.0/24 [20/0] via 10.63.0.1, 00:00:14
B* 0.0.0.0/0 [20/0] via 10.63.0.1, 00:00:14
NatPen_MX_3825#sh ip bg
NatPen_MX_3825#sh ip bgp
BGP table version is 32518, local router ID is 172.20.107.230
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 10.63.0.1 0 1 65000 65000 i
*> 1.4.204.0/24 10.63.0.1 0 1 ?
*> 10.3.202.0/24 10.63.0.1 0 1 ?
*> 10.4.201.0/24 10.63.0.1 0 1 ?
*> 10.4.202.0/24 10.63.0.1 0 1 ?
*> 10.4.204.0/24 10.63.0.1 0 1 ?
*> 10.4.205.0/24 10.63.0.1 0 1 ?
*> 10.20.0.0/16 10.63.0.1 0 1 65000 65000 ?
*> 10.21.0.0/16 10.63.0.1 0 1 65000 65000 i
*> 10.30.0.0/21 10.63.0.1 0 0 1 i
*> 10.30.13.0/24 10.63.0.1 0 0 1 i
*> 10.31.0.0/16 10.63.0.1 0 0 1 ?
*> 10.40.0.0/16 10.63.0.1 0 1 65000 65000 i
*> 10.41.0.0/16 10.63.0.1 0 1 65000 65000 ?
*> 10.60.0.0/16 0.0.0.0 0 32768 i
*> 10.61.1.0/24 10.60.0.2 20 32768 ?
r> 10.63.0.0/16 10.63.0.1 0 0 1 ?
*> 10.90.0.0/16 10.63.0.1 0 1 65000 10 i
*> 10.100.0.32/30 10.63.0.1 0 1 ?
*> 10.100.0.44/30 10.63.0.1 0 1 65000 65000 ?
*> 10.133.201.0/24 10.63.0.1 0 1 ?
*> 10.172.16.0/24 10.63.0.1 0 1 ?
*> 10.254.254.240/32
10.63.0.1 0 1 ?
*> 147.225.40.160/30
10.63.0.1 0 0 1 ?
*> 152.177.74.24/30 10.63.0.1 0 1 65000 ?
*> 152.181.185.68/30
10.63.0.1 0 1 65000 ?
*> 172.16.1.0/24 10.63.0.1 0 1 ?
*> 172.17.29.0/30 10.63.0.1 0 1 65000 65000 ?
*> 172.18.29.0/30 10.63.0.1 0 0 1 ?
*> 172.18.30.0/30 10.63.0.1 0 1 ?
*> 172.22.0.144/30 10.63.0.1 0 1 ?
*> 172.23.9.0/30 10.63.0.1 0 1 65000 65000 ?
*> 172.32.7.0/24 10.63.0.1 0 1 ?
*> 192.168.100.0 10.63.0.1 0 1 ?
*> 199.220.41.176/30
Network Next Hop Metric LocPrf Weight Path
10.63.0.1 0 1 ?
*> 199.220.194.232/30
10.63.0.1 0 1 65000 ?
*> 206.113.119.0/26 10.63.0.1 0 1 65000 65004 ?
*> 206.113.119.128/26
10.63.0.1 0 1 65000 65004 ?
*> 206.169.74.0 10.63.0.1 0 1 65000 65000 ?
NatPen_MX_3825#

NatPen_MX_3825#sh run | in ip rou
ip route 10.61.1.0 255.255.255.0 10.60.0.2
NatPen_MX_3825#

===============================================================================================================

 

router bgp 1
no synchronization
bgp log-neighbor-changes
network 10.30.0.0 mask 255.255.248.0
network 10.30.13.0 mask 255.255.255.0
redistribute connected
neighbor 10.63.0.2 remote-as 65001
neighbor 10.63.0.2 fall-over
neighbor 147.225.40.161 remote-as 65000
neighbor 147.225.40.161 distribute-list no-redist-CV-Routes out
neighbor 172.18.29.2 remote-as 1
no auto-summary


NatPen_SD2#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is 147.225.40.161 to network 0.0.0.0

199.220.41.0/30 is subnetted, 1 subnets
B 199.220.41.176 [200/0] via 10.100.0.34, 3w1d
1.0.0.0/24 is subnetted, 1 subnets
B 1.4.204.0 [200/0] via 10.133.201.254, 3w1d
152.177.0.0/30 is subnetted, 1 subnets
B 152.177.74.24 [20/0] via 147.225.40.161, 4w3d
152.181.0.0/30 is subnetted, 1 subnets
B 152.181.185.68 [20/0] via 147.225.40.161, 4w3d
206.113.119.0/26 is subnetted, 2 subnets
B 206.113.119.128 [20/0] via 147.225.40.161, 4w3d
B 206.113.119.0 [20/0] via 147.225.40.161, 4w3d
199.220.194.0/30 is subnetted, 1 subnets
B 199.220.194.232 [20/0] via 147.225.40.161, 4w0d
172.17.0.0/30 is subnetted, 1 subnets
B 172.17.29.0 [20/0] via 147.225.40.161, 3w0d
172.16.0.0/24 is subnetted, 1 subnets
B 172.16.1.0 [200/0] via 10.133.201.254, 3w1d
172.18.0.0/30 is subnetted, 2 subnets
B 172.18.30.0 [200/0] via 172.18.29.2, 3w1d
C 172.18.29.0 is directly connected, FastEthernet1/1
172.23.0.0/30 is subnetted, 1 subnets
B 172.23.9.0 [20/0] via 147.225.40.161, 1w2d
172.22.0.0/30 is subnetted, 1 subnets
B 172.22.0.144 [200/0] via 172.18.29.2, 3w1d
172.32.0.0/24 is subnetted, 1 subnets
B 172.32.7.0 [200/0] via 10.133.201.254, 3w1d
10.0.0.0/8 is variably subnetted, 21 subnets, 5 masks
C 10.30.0.0/21 is directly connected, GigabitEthernet0/0.1
C 10.31.0.0/16 is directly connected, GigabitEthernet0/0.2
C 10.30.13.0/24 is directly connected, GigabitEthernet0/0.2
B 10.20.0.0/16 [20/0] via 147.225.40.161, 4w0d
B 10.21.0.0/16 [20/0] via 147.225.40.161, 4w3d
B 10.40.0.0/16 [20/0] via 147.225.40.161, 1w2d
B 10.41.0.0/16 [20/0] via 147.225.40.161, 1w2d
C 10.63.0.0/16 is directly connected, GigabitEthernet0/1
B 10.61.1.0/24 [20/20] via 10.63.0.2, 00:01:44
B 10.60.0.0/16 [20/0] via 10.63.0.2, 00:01:44
B 10.100.0.44/30 [20/0] via 147.225.40.161, 4w3d
B 10.133.201.0/24 [200/0] via 172.18.29.2, 3w1d
B 10.100.0.32/30 [200/0] via 172.18.29.2, 3w1d
B 10.90.0.0/16 [20/0] via 147.225.40.161, 4w3d
B 10.172.16.0/24 [200/0] via 10.133.201.254, 3w1d
B 10.4.204.0/24 [200/0] via 10.133.201.254, 3w1d
B 10.4.205.0/24 [200/0] via 10.133.201.254, 3w1d
B 10.3.202.0/24 [200/0] via 10.133.201.254, 3w1d
B 10.4.202.0/24 [200/0] via 10.133.201.254, 3w1d
B 10.4.201.0/24 [200/0] via 10.133.201.254, 3w1d
B 10.254.254.240/32 [200/0] via 10.133.201.254, 3w1d
147.225.0.0/30 is subnetted, 1 subnets
C 147.225.40.160 is directly connected, Serial3/0
B 206.169.74.0/24 [20/0] via 147.225.40.161, 2w1d
B 192.168.100.0/24 [200/0] via 10.133.201.254, 3w1d
B* 0.0.0.0/0 [20/0] via 147.225.40.161, 3w5d
NatPen_SD2#


NatPen_SD2#sh run | in ip route
ip route 0.0.0.0 0.0.0.0 10.133.201.254 210
ip route 1.4.205.147 255.255.255.255 10.100.0.29
ip route 170.146.36.16 255.255.255.255 10.100.0.29
ip route 170.146.234.48 255.255.255.255 10.100.0.29
NatPen_SD2#

3 REPLIES

Dear Sathish,Is the link

Dear Sathish,

Is the link flapping or the BGP is flapping?

If it is the link that is flapping then your BGP with the neighbour and the IGP with the neighbour must flap.

If it is only BGP which is flapping then we have to look in to different scenario , please share the log messages for the notification provided by the peer.

 

BR

Md Thanveer

 

Regards Thanveer "Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."
New Member

Hi Thanveer, Thanks, issue

Hi Thanveer,

 

Thanks, issue was at ISP side, now resolved.

Sounds Great Satish.

Sounds Great Satish.

Regards Thanveer "Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."
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